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Finding the Fourth Proportional to 77.96, 117.02 and 69.80

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Solution

The fourth proportional to 77.96, 117.02 and 69.80 is: 104.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.96 : 117.02 = 69.80 : x
  2. Step 2: Convert to fraction form
    77.96/117.02 = 69.80/x
  3. Step 3: Cross multiply
    77.96x = 117.02 × 69.80
  4. Step 4: Simplify right side
    77.96x = 8,168.00
  5. Step 5: Solve for x
    x = 8,168.00/77.96
  6. Step 6: Final answer
    x = 104.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.